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Trial  of Omicron-specific vaccine booster begun-Moderna

By J.Lo

“Nonetheless, given  long-term threat demonstrated by Omicron’s immune escape, we are advancing our Omicron-specific variant vaccine booster candidate and we are pleased to begin this part of our Phase 2 study,” Moderna chief executive Stephane Bancel said US biotech company Moderna has begun clinical trials of  booster dose of vaccine designed specifically to combat Omicron variant of  coronavirus. 

The trials will involve a total of 600 adults  half of whom have already received two doses of Moderna’s Covid-19 vaccine at least six months ago, and half of whom have received two doses plus previously authorized booster dose.

The booster specifically targeting Omicron will therefore be evaluated as both  third and  fourth dose. 

The company also reported results on the efficacy against Omicron of the booster that has already been authorized.

It said  six months after  booster injection,  levels of neutralizing antibodies against Omicron were reduced by six times from  peak observed 29 days after  injection  but remained detectable in all participants. 

These data were obtained by studying  blood of 20 people who received  50 microgram booster, half the amount of  first two injections.

Moderna’s statement came the day after rivals Pfizer and BioNTech said they had begun enrollment for  clinical trial for an Omicron-specific vaccine.

Both vaccines are based on messenger RNA technology, which makes it relatively easy to update them to keep up with mutations specific to new variants. 

Several countries, including  United States, have begun to see a decline in cases associated with the infection wave caused by Omicron, the most transmissible variant detected so far, but the number of infections worldwide continues to rise. 

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